Ответ:
(7d-4b+2)-(5b²-3b+7)=7d-4b+2-5b+3b-7=7d-b-5-5b²
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Ответ:
(7d-4b+2)-(5b²-3b+7)=7d-4b+2-5b+3b-7=7d-b-5-5b²